Lots of 6.4 owners just change the oil based on Ford’s recommended Severe operating conditions maintenance interval which is every 5K miles for both oil and filter. Solution(s): The most commonly used approach to combat this issue is just to watch the engine oil like a hawk! If you notice the engine oil level rising, then that is a clear indication that fuel is filling up the crankcase. As you can imagine, diesel fuel is not nearly as lubricative as engine oil therefore, the diluted oil has less lubricity overall leading to increased engine wear. This problem is commonplace for the 6.4L and this is arguably the biggest downfall of the engine. This design sounds good on paper but, the major downfall of the design can and is catastrophic because it allows fuel to stick to the cylinder walls which allows it to slip past the rings right down into the crankcase. This is done by injecting fuel while the engine is on its exhaust stroke, allowing the fuel to bleed down into the exhaust. Problem: When the active regeneration process of the DPF filter is taking place, diesel fuel is sent into the exhaust system to raise the temperature of the exhaust and burn all the unburned hydrocarbons out of the DPF. Most Common Problems and Downfalls of the 6.4 If you fix these key problems, the 6.4 can be a great engine and last a very long time. Engine failure is oftentimes catastrophic with the 6.4 Powerstroke if these weak points are not taken care of. So if you are planning on buying a 6.4L Powerstroke or if you already have one and are just looking at making it more reliable, make sure you have a reasonably sized budget set aside to do so.īelow we will cover all of the most common problems with the 6.4 which need to be addressed to avoid engine failure at any level. So can the ole 6.4L be a reliable and dependable engine? The answer is YES, however, there are a lot of bases to cover if you want to ensure you won’t be walking home or getting a tow. If you are fluent in the unique language of diesel engines, you have probably heard something about the 6.4L Powerstroke, and chances are it was not something good but even with all the trash talk this engine gets can it be reliable? If so, what needs to be done to it to make it reliable? Here we will answer those questions and much more about the infamous 6.4L Powerstroke Diesel.
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